Dental chair.



PATENTED JUNE 23, 1908.

F. E. CASE.

DENTAL CHAIR.

APPLICATION IILED Am, 11, 1907.

- vgttarzzaz/f the rear and forward sides thereof.

FRANK E. CASE, OF CANTON, OHIO.

DENTAL CHAIR.

Specification of Letters Patent.

Original application filed June 25, 1906, Serial No. 323,213.

Patented June 23, 1908.

Divided and this application filed April 17, 1907.

Serial No. 368,643.

To all whom it may concern:

Be it known that I, FRANK E. Crisis, a citizen of the United States, residing at Canton, in the county of Stark and State of Ohio, have invented a certain new and useful Improvement in Dental Chairs, the same being illustrated and described, but not claimed, in my application for Letters Patent filed June 25, 1906, Serial No. 323,213, of which application this is a divisional part, and of which invention the following is a specification.

The invention relates to chairs of the kind generally used by dentists, surgeons, barbers and others; and the object of the invention is to provide for ready use a substitute or secondary seat for children who are not large enough to occupy the ordinary seat. This object is attained by the construction, mechanism and arrangement illustrated in the accompanying drawing, in which" Figure 1 is a perspective right view of the upper part of a chair, showing the ordinary seat-cushion removed and the secondary seat in position for use; and Fig. 2, a detached perspective view showing details of the secondary seat with its parts separated.

Similar numerals refer to similar parts throughout the drawing.

The frame 1 of the secondary seat is pivotally connected to the frame 2 of the ordinary seat by means of the parallel connecting bars 3 and 4, one of which is located at each end of the seat and respectively near The upper end of the forward bars are preferably provided with the handles 5 by means of which the secondary seat may be raised on its pivotal connections from its normal prone position, as indicated by broken lines in Fig. 1, to its position for use as shown in full lines in the same figure.

The frame 2 of the ordinary seat is preferably filled in by suitable plates as 6 and 7 so as to provide a suitable foot-rest for a child using the secondary seat, and the secondary seat may be held in its raised position by means of the brace links 8 which are pivoted, together with the upper ends of the rear connecting bars 3, to the seat frame, and at the lower free end are provided with the notches 9, which notches are adapted to engage over the shanks of the headed pins 10 on the lower parts of the forward connecting bars 4, when the secondary seat is raised to its position for use. To lower the seat it is only necessary to disengage these notches from the pins, whereupon the seat is free to be moved forward and downward on its pivotal connections. The secondary seat thus lowered is normally nested under and covered by the ordinary seat-cushion, shown in outline by broken lines, which same is removed when the secondary seat is to be used.

A convenient manner of making the secondary seat is to connect the upper parts of the forward connecting bars 4 with the pivotal rod 11 and to provide the half journal bearings 12 in the upper side of the seat frame 1, in Which bearings the rod is adapted to be located, after which the cushion-plate 13 is riveted on the upper side of the frame thus holding the pivotal rod in its bearing.

And the upper ends of the rear connecting bar and the brace links may be connected to the frame on pivot hubs 14 provided thereon and to be held in position by screws 15 with an intervening washer 16, which details are illustrated in Fig. 2 wherein the different parts of the secondary seat are shown separated. The secondary seat, when raised, is located adjacent to the back of the chair, so that a child sitting on the seat can lean against the back, which may be adjusted to and from the seat as may be desired.

What I claim as my invention, and desire to secure by Letters Patent, is

In a chair, a frame and a detachable ordinary seat thereon, a secondary seat normally nesting on the frame underneath the ordinary seat, and mechanism connecting the secondary seat with the frame whereby it can be raised and sustained on the frame, comprising two pairs of parallel connecting bars pivoted to the frame and to the ends of the secondary seat, one bar of each pair having a pin near one end thereof, and a brace link pivoted to the other end of the other bar of each pair and having a notch in its free end adapted to engage the corresponding pin when the secondary seat is raised.

In testimony whereof I have signed my name to this specification in presence of two subscribing witnesses.

- FRANK E. CASE. Witnesses HARRY FREAsE, MARY A. CAVANAUGH. 

